Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d0f16c7db3cf0a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-05 12:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a0b72839d949707d1e0a625b8fbb3c37 SHA-1: c6a996c22c817b7521b3ddc68f5199d98ea3ace7 SHA-256: 53d0f16c7db3cf0a7580165b557a4dd92e41864de91616970b9c90e63ba5b729
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to medical study PDFs, likely to trick users into clicking the malicious link. The presence of a malicious redirector indicates an attempt to lead the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=upper+limb+bd+chaurasia+pdf In PDF document text
    • http://files.bjstewartconcrete.com/uploads/1/3/0/7/130738714/jilev_xukokewofewo.pdfIn PDF document text
    • http://files.bigbluerock.org/uploads/1/3/2/6/132696598/9d175a53.pdfIn PDF document text
    • http://files.hotdoghols.co.uk/uploads/1/3/1/6/131637043/707450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/wogapijejalovovutowev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/mobijozanapurukefuzoto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/buzalaxevunologudidel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/98756154455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/branded_2012_film.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/30535477699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0698/3318/files/d_d_races_and_classes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6954/6396/files/gegegonalesidiwitig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/7664943819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/pdf_learn_python_the_hard_way.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 5524 bytes
SHA-256: 8be20ce03738b3331af136d402f99e99defff924e1c687d29b5f99f6127e48b6
font_01_sfnt_off0000761d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 13724 bytes
SHA-256: edcc4eacd63f56e02c991b237cd673999454ea78a883d82b8d756a200ac03f64

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